Sea Pen - Kenting (01-02May10) C 085.jpg
Kenting, Taiwan -- Lone sea pen on a sandy expanse.
Sea pens are highly specialized octocorals that usually live in a sandy or muddy substrate.
They are composed of two parts - the above ground rachis, which contains the feeding polyps, and the below-ground muscular peduncle used to anchor the colony to the sea bottom.
Most sea pens are nocturnal; during the day they are buried in the sand and can not be seen.
This photo was taken at dusk.